#include<stdio.h>
#define ONE (1 << 0)
#define TWO (1 << 1)
#define THREE (1 << 2)
#define FOUR (1 << 3)

void Show(int flags){
	if(flags & ONE) printf("one\n");
	if(flags & TWO) printf("two\n");
	if(flags & THREE) printf("three\n");
	if(flags & FOUR) printf("four\n");
}
int main(){
	Show(ONE);
	Show(ONE | TWO) ;
	Show(ONE | TWO | THREE);
	Show(ONE | TWO | THREE | FOUR) ;
	return 0;
}
